Typewriting machine



Marr. 20, 1923.

A. G. F. KuR'owsKl TYPEWRITING MACHINE Filed Aug. l2, 1919 //7 yer/far:7M'

#off/7 lgetentetl Mar. 2Q, i923.

stares Parametric;

ALFRED e. R.` RUROWSKI, or BROOKLYN, Nnw YORK, assreNoR 'ro UNDRRwoonfrYrRwRrrRR COMPANY, or New YoRR, N. Y., a CORPORATION or DELAWARE.

, TYPERIT-ING MACIEINE.

Application filed August 12, 191.9. Serial No. 317,042;

To all whom t may concern.'

Be it known that I., ALFRED G. F. KUROW- sin, a citizen of the UnitedStates, formerly a citizen of Germany, residing in Brooklyn :3 Borough,in the county ot' Kings, city'and State of New `York, have inventedcertain new and useful improvements in Typewriting Machines, of whichthe itollowing is a speciication.

This invention relates to key-tops for typewriter key-levers, and anobject is to provide a readily detachable key-top, and one which can beremoved and replaced without the use of tools. l

A Jr'eature of the invention relates to the provision of a cup, mountedon the keystem, and a ring which engages the cup, and is detachablyconnected to the stem. Preferably, the cup is freely mounted on the key-?.o stem, so that the ring serves to hold the cup in place.

Other features and advantages will hereinafter appear. 1

In the accompanying drawings,

Figure l is a perspective view of a keystem, showing my improved topapplied thereto.

Figure 2 is a side elevation of the keystem.

Figure 3 is a front View.

Figure 4 is a side elevation of the keystem alone, showing the slotswith which the spring detents of the key-ring engage.

Figure 5 is a sectional view.

Figure 6 is a composite view, in perspective, of the key-cup, key-paperand glass.'

Figure 7 is a bottom view ot the key-ring.

rlhe key-lever 1 is provided with a keystem 2, and engaging the top oi'the key-stem 4o is a key-cup 3, which may be of the usual form. lSaidcup, however, does not tit tightly onto the key-stem, but :freelyengages the same. The cup has the usual flange 4. ln order to hold thekey-cup in position on the 1.5 key-stem, a key-ring 5 is provided, saidring having an overturned flange 6, which engages the top of the usualglass 7, under which, and fitting within the lia-nge of the cup, is akey-paper 8, bearing the character so or characters corresponding to thetype carried by the key-lever. The key-ring is so bent as to engage theunder side of the cup, and is provided with a pair of detent springs 9,having angular portions l0 which engage respectively in recesses shownas a pair Uof detent-receiving slots 1l in the key-stem.

The spring detents 9 are yieldable to permit the angular projections l0to escape from the slots l1, or to release the detent-engaging meansformed by these slots, thereby to enable the key-top as a whole to bedetached from the stem 2. It is desirable to provide two slots in thekey-stem, because, if the keystem is quite thin, and only one slot wereprovided the angles ot the spring detents would clash and prevent themfrom properly holding the key-top in position on the key-stem.

When it is desired to change the key-top, all that is necessary is toapply slight force to the key-top, in order to unseat the detents fromthe slots, when the whole key-top may be removed and anothersubstituted.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

Having thus described my invention, I claim:

l. In a typewriter key, the combination with a key-stem, of a key-cupfreely fitting said stem, and a key-ring engaging said cup anddetachably secured to said stem.

2. In a typewriter key, the combination with a key-stem, of a key-cupmounted on said stem,fa key-ring, and means for detachably securing saidkey-cup to the stem through the medium of said ring.

3. In a typewriter-key, the combination with a key-stem having adetent-receiving recess therein, of a detachable key-top comprising akey-cup and a key-ring, and a spring detent carried by said ring forengagement in said recess in the stem and yieldable out of said recessto enable the detachment of the key-top from the stem.

4. In a typewriter key, the combinationr with a key-stem, of a key-topcomprising a key-cup and a key-ring, and spring detents carried by saidring for engagement with said stem.

5. In a, typewriter-key, the combination with a key-stem provided withdetent-engaging means, of a detachable key-top comprising a key-cupv anda key-ring, and a spring detent carried by said ring for automaticengagement with said means and' automatically yieldable to release saidmeans to enable the detachment of the key-top from the stem.

6. In a typewriter key, the combination with a key-stem, ofakey-euphaving a stemreceiving socket mounted O nfsaid keystem,

' a key-paper yand glass in said cup, and a flanged ring engagingsaideupand clamping- SaiClkey-papier and fglass, Said 'ring be? ing providedwith sprngineans engaging said stemand movable to release said ring.

7. In a typewriter key,heV oombination With a key-stem having aslot, ofa vkey-cup having a stem-receiving socket mounted on said key-stem, andalarrgedring-fengaging' 'said cup andy having spring 'means' engaging*said slot and movable to release said ring.

8. ln a typewriter-key, the combination With'a-key-Stem having thereinapair of detent-'receiving slots, of a detachable key-top comprising akey-cup and a keyjringJ and a p`a1r of spring detents carried by saidring and engageable respectively 'in said slots and yielolable4therefrom to enable the detach-

